functional tests: TestFailure: don't rely on systemd debug logs
functional tests: TestFailure: don't rely on systemd debug logs

Don't rely on systemd debug logs: this can change from one version to
another and this can be redirected to the journal.

Instead, use commands like "rkt list" and "rkt status" to find the
status of the pod. Moreover, this tests more rkt commands too.

luebken/rkt,iaguis/rkt,dgonyeo/rkt,akshaykarle/rkt,fdserr/rkt,ybubnov/rkt,squaremo/rkt,matthaias/rkt,liugenping/rkt,jakon89/rkt,rot26/rkt,lucasallan/rkt,wparad/rkt,squaremo/rkt,krnowak/rkt,endocode/rkt,tv42/rkt,jzelinskie/rkt,kbrwn/rkt,michelangelo13/rkt,shtouff/rkt,lucasallan/rkt,yifan-gu/rocket,michelangelo13/rkt,lucasallan/rkt,intfrr/rkt,yifan-gu/rocket,linki/rkt,alban/rkt,yifan-gu/rocket,rkt/rkt,mike1729/rkt,lee212/rkt,squeed/rkt,kinvolk/rkt,sstabellini/rkt,sgotti/rkt,crawford/rkt,sstabellini/rkt,Wilybald/rkt,tmrts/rkt,bsmr-go/rkt,shtouff/rkt,mike1729/rkt,kinvolk/rkt,joshix/rkt,coreos/rkt,squeed/rkt,Wilybald/rkt,dalanlan/rkt,marineam/rkt,chrisseto/rkt,dgonyeo/rkt,sstabellini/rkt,cab105/rkt,jonboulle/rkt,mjg59/rkt,chrisseto/rkt,luebken/rkt,Wilybald/rkt,liugenping/rkt,yifan-gu/rkt,s-urbaniak/rkt,squeed/rkt,fdserr/rkt,shobhit85/rkt,cab105/rkt,iaguis/rkt,mattthias/pkg-rkt,alexhersh/rkt,blixtra/rkt,dgonyeo/rkt,marineam/rkt,endocode/rkt,matthaias/rkt,maquanyi/rkt,il9ue/rkt,jzelinskie/rkt,marineam/rkt,Shashwatsh/rkt,alban/rkt,mjg59/rkt,sgotti/rkt,kbrwn/rkt,monstermunchkin/rkt,jakon89/rkt,tv42/rkt,iankronquist/rkt,tixxdz/rkt,shtouff/rkt,mike1729/rkt,nhlfr/rkt,MattDees/rkt,jjlakis/rkt,monstermunchkin/rkt,bsmr-go/rkt,shobhit85/rkt,rkt/rkt,achanda/rkt,s-urbaniak/rkt,Wilybald/rkt,MattDees/rkt,joshix/rkt,Shashwatsh/rkt,rot26/rkt,smarvin/rkt,ybubnov/rkt,liugenping/rkt,chrisseto/rkt,lucasallan/rkt,jakon89/rkt,ybubnov/rkt,coreos/rkt,tixxdz/rkt,intelsdi-x/rkt,alexhersh/rkt,luebken/rkt,euank/rkt,monstermunchkin/rkt,jasonchaffee/rkt,sinfomicien/rkt,coreos/rkt,yifan-gu/rkt,krnowak/rkt,intelsdi-x/rkt,sinfomicien/rkt,rkt/rkt,liubq919/rkt,tmrts/rkt,dalanlan/rkt,jzelinskie/rkt,maquanyi/rkt,euank/rkt,smarvin/rkt,il9ue/rkt,michelangelo13/rkt,yifan-gu/rkt,cab105/rkt,matthaias/rkt,ChengTiesheng/rkt,blixtra/rkt,joshix/rkt,smarvin/rkt,jasonchaffee/rkt,nhlfr/rkt,achanda/rkt,il9ue/rkt,intfrr/rkt,kbrwn/rkt,jjlakis/rkt,lee212/rkt,linki/rkt,joshix/rkt,intelsdi-x/rkt,Yhgenomics/rkt,markllama/rkt,crawford/rkt,lee212/rkt,iankronquist/rkt,rhvgoyal/rkt,rhvgoyal/rkt,Shashwatsh/rkt,krnowak/rkt,euank/rkt,jonboulle/rkt,tv42/rkt,achanda/rkt,markllama/rkt,iankronquist/rkt,fdserr/rkt,kinvolk/rkt,markllama/rkt,Yhgenomics/rkt,Yhgenomics/rkt,mjg59/rkt,jonboulle/rkt,intfrr/rkt,MattDees/rkt,adfernandes/rkt,tmrts/rkt,jjlakis/rkt,wparad/rkt,tixxdz/rkt,liubq919/rkt,maquanyi/rkt,alexhersh/rkt,s-urbaniak/rkt,kinvolk/rkt,rkt/rkt,liubq919/rkt,adfernandes/rkt,sinfomicien/rkt,bsmr-go/rkt,wparad/rkt,sgotti/rkt,blixtra/rkt,rot26/rkt,squaremo/rkt,akshaykarle/rkt,rhvgoyal/rkt,jasonchaffee/rkt,ChengTiesheng/rkt,mattthias/pkg-rkt,shobhit85/rkt,crawford/rkt,adfernandes/rkt,iaguis/rkt,alban/rkt,endocode/rkt,ChengTiesheng/rkt,mattthias/pkg-rkt,dalanlan/rkt,akshaykarle/rkt,nhlfr/rkt,linki/rkt